There are thousands of relays run by altruistic volunteers. Unless your opsec sucks (i.e. you configure Tor to favor performance and not swap circuits every ten

There are thousands of relays run by altruistic volunteers. Unless your opsec sucks (i.e. you configure Tor to favor performance and not swap circuits every ten minutes) the opportunity to correlate by malicious nodes is small. Also, these nodes operated by bad actors are constantly identified and excluded.